1-(4-octadecanoylpiperazin-1-yl)octadecan-1-one

1-(2-propan-2-yloxyphenyl)piperazine

piperazine-1,4-dicarbothioic acid bis-allylamide

1-Thiophen-2-ylmethyl-piperazine

1-(3-m-Tolyloxy-propyl)-piperazine